BEIRUT — Syrian
rebels have begun a major operation in the Aleppo region, aiming to
strike at security compounds and bases around Syria's largest city,
activists said Friday.

It would be evidence that weeks of intense
bombardments by the Syrian military, including airstrikes, have failed
to dislodge the rebels. Instead, fighting rages across the country in a
17-month civil war that shows no sign of ending soon.

The rebel
offensives in Aleppo are led by a brigade made up mostly of army
defectors who specialize in operating artillery and tanks, said Mohammed
Saeed, an activist based in the city.

He said the first attacks
began shortly before midnight Thursday and lasted until Friday, when the
"Brigade of Free Syrians" launched coordinated strikes on several
security compounds in Aleppo.

"The new operations aim to strike at regime forces' centers and air bases throughout Aleppo (province)," Saeed said via Skype.

The
Britain-based Syrian Observatory for Human Rights said one of Friday's
targets was a compound in the Aleppo neighborhood of Zahraa, killing and
wounding a number of troops. It gave no figures.

Saeed said rebels attacked four security buildings around Aleppo, using tanks, rocket launchers and machine guns.

The state-run news agency, SANA, said troops killed and wounded several gunmen in the clashes.

Rebels
took parts of Aleppo, Syria's commercial capital, last month. Since
then, government forces have been trying to recapture them. Rebels also
control much of the wider Aleppo province, including areas on the border
with Turkey.

Activists estimate more than 20,000 people have been killed in the uprising against President Bashar Assad's regime.

There
has been fighting all over Syria, including the capital, Damascus,
showing that the rebels have a presence in main population centers, not
just the outlying districts where they started.

The Observatory
and the Local Coordination Committees, another activist group, reported
clashes and shelling between troops and rebels in other areas, including
the southern province of Daraa, around Damascus and in the central
region of Homs.

The Observatory reported heavy clashes inside the
sprawling Abu Zuhour air base in the northwestern province of Idlib,
saying that anti-government gunmen were advancing, storming officers'
housing units. The clashes in and around Abu Zuhour air base have been
going on for the past two days. The reports could not be confirmed
independently.

Syrian rebels said they shot down a Russian-made MiG fighter jet over Idlib on Thursday.

Over
the past month, the Syrian regime has been relying much more heavily on
air power, escalating the fight with rebels as its ground forces have
been stretched thin fighting on many fronts. The military has conducted
air raids on the northern regions of Idlib and Aleppo near Turkey as
well as the eastern province of Deir el-Zour.

The increased use of
air power is likely a factor in the high daily death tolls, which
activists say have been averaging 100-250 lately.

In Geneva, the
U.N. refugee agency reported a growing number of Syrians fleeing to
Lebanon's eastern Bekaa Valley, near the Syrian border.

Agency
spokesman Adrian Edwards said local authorities report about 2,200
people arrived there over the past week, almost double the weekly
average. He told reporters Friday in Geneva that another 400 Syrians are
reaching northern Lebanon each week.

Edwards said Turkey has
opened two more refugee camps for Syrians in the past week and is now
hosting 80,410 people in 11 camps and schools in its border provinces.

In
France, Foreign Minister Laurent Fabius warned that France would use
military force if President Bashar Assad ever uses his chemical weapons.
"Our response would be immediate and sharp as lightning," Fabius said
Friday on Europe-1 radio.

He suggested that France would not wait
for U.N. permission for such a response. "Bacteriological and chemical
weapons are of a different nature from ordinary arms," he said. "We
cannot tolerate that these weapons, whose fallout could spread, would be
used."

Last month, Syria threatened that if it has chemical and biological weapons, it would use them to face a foreign attack.

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